Relative transcription levels of sugar transfer-related genes in Endocarpon pusillum after supplementation with different carbohydrates. The names of the genes are listed on the top of the picture. Heptagons represent the gene encoding the tetracycline transporter, hexagons represent sugar transporter genes, and pentagons represent genes encoding enzymes of sugar metabolism. The culture time is displayed on the left and sugars added into BBM are listed on the right. The log2 relative expression with respect to the control group is illustrated in the heat map.